Home / 1,124.18-1,686.37-393.81

Finding the Fourth Proportional to 1,124.18, 1,686.37 and 393.81

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Solution

The fourth proportional to 1,124.18, 1,686.37 and 393.81 is: 590.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.18 : 1,686.37 = 393.81 : x
  2. Step 2: Convert to fraction form
    1,124.18/1,686.37 = 393.81/x
  3. Step 3: Cross multiply
    1,124.18x = 1,686.37 × 393.81
  4. Step 4: Simplify right side
    1,124.18x = 664,112.29
  5. Step 5: Solve for x
    x = 664,112.29/1,124.18
  6. Step 6: Final answer
    x = 590.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.